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A137639 Triangle read by rows, A026794 * A051731. 1
1, 2, 1, 3, 0, 1, 5, 2, 0, 1, 7, 1, 0, 0, 1, 11, 3, 2, 0, 0, 1, 15, 2, 1, 0, 0, 0, 1, 22, 6, 1, 2, 0, 0, 0, 1, 30, 5, 3, 1, 0, 0, 0, 0, 1, 42, 9, 2, 1, 2, 0, 0, 0, 0, 1, 56, 9, 3, 1, 1, 0, 0, 0, 0, 0, 1, 77, 16, 6, 3, 1, 2, 0, 0, 0, 0, 0, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Left border = A000041 starting with offset 1: (1, 2, 3, 5, 7, 11, 15,...). Row sums = A137640: (1, 3, 4, 8, 9, 17, 19,...).

LINKS

Table of n, a(n) for n=1..78.

FORMULA

A026794 * A051731 as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle are:

.1;

.2, 1;

.3, 0, 1;

.5, 2, 0, 1;

.7, 1, 0, 0, 1;

.11, 3, 2, 0, 0, 1;

.15, 2, 1, 0, 0, 0, 1;

.22, 6, 1, 2, 0, 0, 0, 1;

.30, 5, 3, 1, 0, 0, 0, 0, 1;

....

CROSSREFS

Cf. A000041, A137640, A026794, A051731.

Sequence in context: A158902 A137587 A168021 * A239631 A113288 A199580

Adjacent sequences:  A137636 A137637 A137638 * A137640 A137641 A137642

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Jan 31 2008

STATUS

approved

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Last modified June 17 21:47 EDT 2019. Contains 324200 sequences. (Running on oeis4.)